The question, as stated, cannot be answered sensibly. A gram is a measure of mass, with dimensions [M]. A dollar is the name of a currency used in several countries, with different values. The two measure different things and basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
Information on the country in question, the denomination (one 100-dollar bill, or 10000 cents or something in-between) would be the minimum requirement.
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.1 Kg = 100 grams
100 grams.
1 kg = 1000 grams so 7 dollars per kg = 7 dollars per 1000 grams. Dividing by 2: 3.5 dollars for 500 grams.
1,000 grams = 1.000 kg 100 grams = 0.100 kg
100/4 = 25 dollars.